US3500387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ptm to pcm and pcm to ptm conversion circuitry
Assignee: International Standard Electric Corp
•
Filing: 1964-12-07
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Granted: 1970-03-10
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Expires: 1984-12-07
Abstract
No abstract record available.
Inventors
- 👤 George Frederick Craven
- 👤 Antoni Emil Karbowiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:24
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/10; H03M1/1009
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3020350A
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US2560434A
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US2485821A
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US2877413A
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US2888647A
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US3016527A
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US3313922A
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US3264454A
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US3268886A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-09 | 1973-09-08 | 1974-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-09 | 1977-09-08 | 1978-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-09 | 1981-09-08 | 1982-03-10 | $7700.00 | Window Closed / Lapsed |